Historical Starting Tech Asymmetry - Some starting Tech levels are changed to be more historical. The rest of Military Advances bonuses got changed and/or rebalanced, but of course what they do and how much are not final In the Military Advances itself, Light and Heavy Infantries got merged, and the new spots got taken by Skirmish and Melee Techniques, which grant bonuses to Troops' Attack Values and decreases the chances of using bad tactics. Tech Changes - Town and Church Infrastructures are merged into singular Cities and Temples, the free spot in the Economy Advances got taken by Shipbuilding from the Military Advances. CK2 Dev Diary #120 - Tech and Combat Changes